What are opportunity costs? How do explicit and implicit costs relate to opportunity costs?

2. If the average total cost curve is falling, what is necessarily true of the marginal cost curve? If the average total cost curve is rising, what is necessarily true of the marginal cost curve?

3. List and describe the characteristics of a perfectly competitive market.

4. Why would a firm in a perfectly competitive market always choose to set its price equal to the current market price? If a firm sets its price below the current market price, what effect would this have on the market?

5. Explain how a firm in a competitive market identifies the profit-maximizing level of production. When should the firm raise production, and when should the firm lower production?

6. If identical firms that remain in a competitive market over the long run make zero economic profit, why do these firms choose to remain in the market?